10:45 〜 12:15
[PEM09-P18] Study of relationship between the fix rate of Real-Time Kinematic positioning and ionospheric conditions
キーワード：電離圏、RTK測位、フィックス率
“Council for the advancement of space weather forecast” was held in the first half of 2022 by the Ministry of Internal Affairs and Communications.
(https://www.soumu.go.jp/main_sosiki/kenkyu/space_weather/index.html)
In the council, “Working group on space weather alert criteria” was established and a new alert system was discussed. It is reported that there is no clear international space weather standard for positioning derived from user-side requirements and the threshold for issuing a warning should be quantitatively determined.
(https://www.soumu.go.jp/menu_news/s-news/01tsushin05_02000047.html)
In this study, we focused on real-time kinematic(RTK) positioning, which uses dual frequency for precise positioning. RTK positioning errors were analyzed with GEONET observation network data operated by the Geospatial Information Authority(GSI) for stations with rover stations separated by about 10 km. Both of event study and statistical study were performed to clarify the relationship between the fix rate of RTK positioning and ionospheric conditions. Event study shows that during the ionospheric disturbances such as plasma bubbles and medium scale travelling ionospheric disturbances, the fix rate decreased. Statistical analysis shows that the fix rates decreased with increase of ionospheric Total Electron Content(TEC) and a rate of TEC change index, which is an index of TEC disturbances. In this presentation, we show these results as a start point of determining the threshold for a new alert system.
(https://www.soumu.go.jp/main_sosiki/kenkyu/space_weather/index.html)
In the council, “Working group on space weather alert criteria” was established and a new alert system was discussed. It is reported that there is no clear international space weather standard for positioning derived from user-side requirements and the threshold for issuing a warning should be quantitatively determined.
(https://www.soumu.go.jp/menu_news/s-news/01tsushin05_02000047.html)
In this study, we focused on real-time kinematic(RTK) positioning, which uses dual frequency for precise positioning. RTK positioning errors were analyzed with GEONET observation network data operated by the Geospatial Information Authority(GSI) for stations with rover stations separated by about 10 km. Both of event study and statistical study were performed to clarify the relationship between the fix rate of RTK positioning and ionospheric conditions. Event study shows that during the ionospheric disturbances such as plasma bubbles and medium scale travelling ionospheric disturbances, the fix rate decreased. Statistical analysis shows that the fix rates decreased with increase of ionospheric Total Electron Content(TEC) and a rate of TEC change index, which is an index of TEC disturbances. In this presentation, we show these results as a start point of determining the threshold for a new alert system.